/*
 * Copyright © 2014 Christian Pesch
 * Copyright © 2014 devemux86
 *
 * This program is free software: you can redistribute it and/or modify it under the
 * terms of the GNU Lesser General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with
 * this program. If not, see <http://www.gnu.org/licenses/>.
 */
package org.mapsforge.map.scalebar;

public final class NauticalUnitAdapter implements DistanceUnitAdapter {
	public static final NauticalUnitAdapter INSTANCE = new NauticalUnitAdapter();
	private static final int ONE_MILE = 1852;
	private static final int[] SCALE_BAR_VALUES = { 9260000, 3704000, 1852000, 926000, 370400, 185200, 92600,
		37040, 18520, 9260, 3704, 1852, 926, 500, 200, 100, 50, 20, 10, 5, 2, 1 };

	private NauticalUnitAdapter() {
		// do nothing
	}

	@Override
	public double getMeterRatio() {
		return 1;
	}

	@Override
	public int[] getScaleBarValues() {
		return SCALE_BAR_VALUES;
	}

	@Override
	public String getScaleText(int mapScaleValue) {
		if (mapScaleValue < ONE_MILE / 2) {
			return mapScaleValue + " m";
		}
		if (mapScaleValue == ONE_MILE / 2) {
			return "0.5 nm";
		}
		return (mapScaleValue / ONE_MILE) + " nm";
	}
}
